Sound recording device



mg., 9,1927.. l.

H. WV. VVFLBIEB SOUND RECORDING DEVICE Filed April 1.1,1923 2 SheeSmShee'l SOUND RECORDING DEVICE Filed April ll. 1923 2 Sheets-Shee'cg Patented Aug. 9, 1927.

i i f M3892@ HARTWELL V. WEBB, OF LENA., NEWT soUNnnnoon-mna nn'vrcn.

Application filed April 11, 19523. Serial No. 631,265.

This invention relates generally to the construction of sound recording machines and particularly to devices of this general nature which are adapted for home or individual use in the production of talking machine records.

The invention includes a vertical post 'mounted on a base adapted to be set on the floor of the turntable chamber of any phonograph? the post being; provided vvith a tubular arm terminating in a sound box carrying a cuttingstylus and a guiding; arm carrying a stylus adapted to follow the tracking; groove of a directing groove zone. The other end of the tubular arm terminates in a y receiving horn Whose Weight is so related to the other end of the arm as to produce a desirable balance and distribution of the Weight of the parts carried on opposite sides of the post and prevent an undue application of pressure on the cutting stylus as Well as to produce a condition ofstable equilibrium in the supporting post.

A feature of the invention resides in the "i mounting of the stylus arm in such manner that it is maintained in a constant state of spring` tension exerted in different directions and by means of which the sensitiveness of `the stylus to impulses imparted to the sound box diaphragm attains a desirably advantageous operating eiiiciency.

Another featureof the invention resides in the mounting" of the guiding arm in'suoh relation to the tubular arm that there is no vibratable connection therebetween so that the guiding arm and the sound bon carrying arm perform their functions without any interference from each other. i

Other features of the invention Will be hereinafter referred to.

ln the draivinnjH in which a preferred form of the invention has been selected for illustration, y

Figure 1 is a plan view of a preferred embodiment of the invention.

Fi gure 2 is a vieiv in side elevation of the device shown in Figure 1. y

Figure is a view similar to Figure 2 taken from the left of Figure 2.

Figure i is a sectional vievv on an enlarged scale of a detail of construction employed in the device.

Figure 5 is a plan view of a sound box and recording stylus.

Figure 6 is a view in side elevation of the device shown in Figure 5.

F igure 7 is a detail view of the stylus herder and spring'.

lteieiring; to the drawings lor a more detailed description of the invention, at 1.0 is

shoivn a post extendin,0` upwardly from a base member 11 and having1 a reduced section throughout its upper part to receive a sleeve 12 which is adapted to turn on the re duced post section and rests on a ball bearing structure 13. The sleeve 12 supports a bracket 1t which may be adjusted vertically along; the sleeve tlni'ouab the use of the thumb set screw 15. rlhe bracket 14 is attached to the side of a tapering tubular sound conveyinpginember 15 which is attached at one end through a hinge coupling 1G with a sound bei: 17 equipped with a recordinue1 stylus. The other and larger end of the tubular arm 15 terminates in a sound 75 receiving' horn 1S and it will be seen that the attachn'ient of the supporting bracket 14 to a point of the tubular arm intermediate the horn 1S and the sound bon 17 produces a balanced relation of the Weight supported 30 by the vertical post so that the sound bon 17 does not cause the stylus to bear with undue pressure on the ivan or other material in which the sound record is being formed.

ln addition to the sound-boX-supporting 35 tubular arm l5 the sleeve 12 also supports a rigid arm 19 which extends in a direction parallel to the anis of the tubular arm 15 and is provided with a recess and screw 2() for noldinr; a stylus 21 formed of Wood or 9U ance of the respective functions of the tubular arm and the raiding arm Without interference through mechanical vibrations, with each other.

The vertical adjustment of the tubular arm 15 along the vert-ical sleeve 12 provides 105 for the holding; of the smaller end of the tubular arm lat an elevation such that the sound bon 17, through its hinged connection 16 with the tubular arm, will bear with merely its own weight on the Wax in which 11o the recording' stylus is operating'. This provision for a minimum Weight pressing on Whose spiral groove guides the arm 19 95 

